JPH0516952B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an electric resistance welded pipe manufacturing apparatus that, when heating and welding an unwelded pipe body formed by forming using a high frequency induced current, etc., the V convergence point of the edge part is set at the center of the welding roll. This invention relates to a seam guide device for guiding the seam to the seam.

In electric resistance welded pipe manufacturing equipment, the steel strip is formed by forming, and uneven thickness of the steel strip,
A twisting phenomenon in the material called rolling may occur due to side bending, uneven tightening of forming rolls, or other factors. As a result, the V convergence point of the edge part deviates from the proper approach position and deviates from the center of the welding roll, causing defects in the butt shape, changes in the amount of upset, etc., and making it impossible to obtain a healthy quality of the welded part, such as poor welding strength. There were often cases where there was none.

In order to solve this problem, conventionally, as shown in FIG. 1, a seam guide fin 12 is inserted and guided within the V convergence angle a of the unwelded tube body 11 which is formed by passing through the forming final roll 10, and the support roll No. 13 proposed a method of guiding the V convergence point 14 of the edge portion to the center of the welding rolls 15, 15. However, from FIGS. 2a and 2b, the seam guide fin 12 and the support roll 13
is a shaft 12 mounted perpendicular to the tube axis.
a, 13a, the seam guide fin 12 and support roll 13 can only be moved in the vertical direction and perpendicular direction with respect to the tube axis. This was done by moving perpendicular to the tube axis. Reference numerals 16 and 17 are a vertical adjustment device and a vertical adjustment device with respect to the tube axis of the seam guide device.

However, with this method, the seam guide fin 12
can move only in the vertical direction and in the direction perpendicular to the tube axis, so if the seam part is twisted, one edge part 18 is pressed by the seam guide fin 12 in the direction perpendicular to the tube axis, as shown in Fig. 2c. I had to fix it. For this reason, the edge part is strongly pressed in the right angle direction, causing pain at the edge part, or because only one edge part is pushed strongly, the seam part opens and it is not possible to obtain an appropriate entry angle, and the shape of the edge part is different from left to right. Problems such as lack of symmetry occurred.

The present invention solves the above-mentioned drawbacks and provides a seam guide device for guiding the V convergence point of the edge portion to the center of the welding roll while maintaining a proper approach angle without damaging the edge portion. be.

In order to achieve the above object, the present invention has the following configuration. That is, a head rotatably provided around a predetermined tube axis, and a support roll including a seam guide fin and a plurality of other supports provided on the head at intervals in the circumferential direction of the tube axis. The apparatus includes: a roll; and a rotation device for rotating the head in a direction opposite to the twisting direction of the unwelded tube body held by the plurality of support rolls.

An embodiment of the present invention will be described in detail below with reference to the accompanying drawings. In FIGS. 3 and 4, the unwelded pipe body 11 is
Support roll 3 including seam guide fins 31
2 and several other support rolls 33, 33'
(Two pieces are shown in this example). Each support role 32, 33, 3
3' is pivotally attached to a roll holder 34, and each roll holder is connected to the head 35 via a slider (not shown), and relative to the tube axis by a fine adjustment device 36 (only one is shown in this embodiment). It is provided to be adjustable in the vertical direction.

The head 35 is attached to a head holding plate 40 by a head holder 39 so as to be rotatable about the tube axis by means of a rack 37 and a pinion 38 fixed around the head. 41 is a head rotation device for rotating the head 35; The head holding plate 40 is slidably fixed to a sliding plate 44 via a sliding groove 43 provided in a main column 42 of the apparatus. 45 is an adjustment device for sliding the head holding plate 40 in the vertical direction. Further, the sliding plate 44 is slidably attached to the substrate 47 via a sliding groove 46. 48 is an adjustment device for sliding the sliding plate 44 in the left-right direction. The board 47 is fixed to the bed (not shown) of the main body of the electric resistance welded tube manufacturing apparatus with bolts.

Since the seam guide device according to the present invention has the above-described configuration, it can be adjusted in the left-right direction, up-down direction, vertical direction, and rotational direction with respect to the tube axis.

Next, the operation of the seam guide device according to the above invention will be explained. The sliding plate 44 is adjusted by the adjustment device 48.
The head holding plate 40 is slid in the vertical direction by the adjustment device 45 to center the seam guide device in advance. Then, the support rolls 32, 3 are adjusted by the fine adjustment device 36.
3 and 33' are expanded and contracted to press the unwelded tube body 11 in a direction perpendicular to the tube axis to accurately center it. At this time, the unwelded tube body 11 is held in a predetermined shape by the support rolls 32 including the seam guide fins 31, but when a twisting phenomenon called rolling occurs in the raw steel strip, the V convergence point of the edge portion It will deviate from the proper entry position and deviate from the center of the welding roll, resulting in defective products such as poor butt shape. Therefore, in order to correct the twist, the unwelded tube body 11 is held in a predetermined shape by the support roll 32 including the seam guide fin 31, and the twist is corrected by the head rotation device 41 with the head 35 around the tube axis. Rotate in the opposite direction. In this case, the unwelded tube body 11 surrounded by support rolls 32, 33, 33'
Since the seam guide fin 31 will not be strongly pressed against one edge 18 of the opening, the predetermined seam guide fin 31 will not be pressed strongly against the edge 18 of the opening, and the specified result will not occur, such as deviation of the opening, abnormality of the V convergence angle, or damage to the edge. It is possible to guide the V convergence point to the center of the welding roll while maintaining the shape.

Furthermore, when changing rolls due to size changes or roll polishing, the support roll can be expanded or contracted by using, for example, a scroll chuck as the head, so that expansion and contraction can always be performed around the tube axis, making it easy to adjust the centering. However, slight changes in the diameter of the support roll due to wear of the support roll can be adjusted by a vertical fine adjustment device attached to the roll holder.

As described above, if the seam guide device according to the present invention is used, when guiding the V-convergent part of the unwelded pipe body to the center of the welding roll, it is possible to avoid the problem of poor opening of the seam with respect to the pipe axis by pressing only one edge. It is possible to prevent edge damage or deformation of the tube before it enters the welding roll, and it is extremely effective in reducing machine stoppages for these adjustments, improving workability, and improving quality. After passing through the seam guide device, the unwelded tube body flows to the subsequent process with its positional deviation corrected, so that the subsequent process can be performed with high precision.

[Brief explanation of the drawing]

Fig. 1 is a general layout diagram of the vicinity of the welding roll of an ERW pipe manufacturing device, and Fig. 2 is an explanatory diagram of an embodiment of a conventionally used seam guide device. Fig. 1 is a drawing showing the relationship between the tube body, seam guide fins and support rolls as viewed from the arrow A-A; c is a drawing showing a state in which the twist is rotationally corrected by movement of the seam guide fins when twisting occurs in the tube body; 3 is a perspective view of the seam guide device according to the present invention, FIG. 4 is a front view thereof, and FIG. 5 is a side view thereof. DESCRIPTION OF SYMBOLS 10... Forming final roll, 11... Unwelded pipe body, 12... Seam guide fin, 12a... Seam guide fin axis, 13... Support roll, 14
...V convergence point, 13a...Support roll axis, 15...
Welding roll, 16... Lateral direction adjustment device, 17... Vertical direction adjustment device, 18... Edge portion, 31... Seam guide fin, 32, 33, 33'... Support roll, 34... Roll holder, 35... Head, 3
6... Fine adjustment device, 37... Rack, 38... Pinion, 39... Head holder, 40... Head holding plate, 4
DESCRIPTION OF SYMBOLS 1... Head rotation device, 42... Main pillar, 43... Slide groove, 44... Sliding plate, 45... Adjustment device, 46... Slide groove, 47... Board, 48... Adjustment device.

Claims (1)

[Scope of Claims] 1. A head rotatably provided around a predetermined tube axis; a support roll that is provided on the head at intervals in the circumferential direction of the tube axis and includes seam guide fins; a plurality of support rolls; and a rotation device for rotating the head in a direction opposite to the twisting direction of the unwelded tube body held by the plurality of support rolls. Seam guide device for electric resistance welded pipe manufacturing equipment.